lab10

Background: see https://en.wikipedia.org/wiki/Visual_cryptography

Website offering this user journey:

• Upload picture (browse or drag'n drop)
• Show the 2 encrypted components
• Download button for downloading them

The website should have a minimal, non-ugly interface and be mobile friendly.
Support for modern browsers only ok (but incompatible ones should get a warning msg).

The upload component should have a size limit and accept only compatible file types (initially png only).
To be checked before uploading to server. Reasonable err messages if something is not ok.
Server: enforce the limitations (don't give room for DOS or worse).

Upload functionality to be implemented in a simple and modern way (jquery?).

The computation can be done by "this Python script":https://github.com/LessonStudio/VisualCryptography.

Backend: simple PHP script invoking the python script.
The uploader should generate a filename which is unique (do on server in order to avoid tampering possibilities).
Delete all files after serving back to client.

Not sure if sync or async communication better. Options:

• Client uploads, then polls for resulting files
• Client upload blocks until generation of resulting files done, then downloads

The website should additionally show some basic information about what's being done here, link to Wikipedia for more details.